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Agilent Technologies 33120A manual AM Modulation Depth Verification, Vrms 0.0061 Vrms

Models: 33120A

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Chapter 4 Calibration Procedures

AM Modulation Depth Verification

AM Modulation Depth Verification

This test verifies the modulation depth specification.

Select each function generator output in the table below. Use a DMM to measure the function generator ACrms output voltage. Compare the measured results to the test limits shown in the table. This is a HIGH Z output termination test.

			Agilent 33120A							Measurement

						AM Modulation
	Function	OUT 1	Ampl	Freq		Shape	Freq		Depth	Nominal	Error
	Function	TERM	Ampl	Freq		Shape	Freq		Depth	Nominal	Error
		TERM
Q	Sine wave	HIGH Z	1.0 Vrms	1.00 kHz		Sinewave	100 Hz		0%	0.50 Vrms – 0.005 Vrms
	Sine wave	HIGH Z	1.0 Vrms	1.00 kHz		Sinewave	100 Hz		100%	0.61 Vrms – 0.0061 Vrms

4

1Output termination set using front panel controls. HIGH Z assumes no load on output. 50W assumes a 50W – 0.1W load on output.

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Image 63

Agilent Technologies 33120A manual AM Modulation Depth Verification, Vrms 0.0061 Vrms

Contents

Agilent 33120A MHz Function Arbitrary Waveform Generator Service GuidePage Flexible system features Convenient bench-top featuresFront Panel at a Glance Front-Panel Number Entry MODulation Menu Front-Panel Menu at a GlanceTrig Display AnnunciatorsUse the front-panel Input / Output Menu to Rear Panel at a GlanceThis Book Page Contents Contents Service SchematicsReplaceable Parts Contents Specifications Waveforms Modulation Characteristics General Specifications Product Dimensions Page Quick Start Quick Start Check the list of supplied items One User’s Guide 〈 This Service GuideConnect the power cord and turn on the function generator To prepare the function generator for useIf the function generator does not turn on Verify that there is ac power to the function generatorVerify the power-line voltage setting Verify that the power-line fuse is goodRemove the power cord . Remove To adjust the carrying handle Set the units to the desired value To cancel the number mode, press Shift CancelTo set the output frequency Enter the magnitude of the desired frequencyEnter the magnitude of the desired amplitude To set the output amplitudeEnter the magnitude of the desired offset How to change the offset to -1.5 mVdcEnable the offset modify mode To set a dc offset voltageOutput the waveform with the displayed duty cycle To set the duty cycleSelect the square wave function Enter the desired duty cycleSelect and output the displayed arbitrary waveform To output a stored arbitrary waveformDisplay the list of arbitrary waveforms Move across to the Exprise choiceEnter the magnitude of the desired voltage To output a dc voltageSave the instrument state Set up the function generator to the desired configurationTurn on the state storage mode To store the instrument stateRecall the stored instrument state Restore the instrument stateTo rack mount the function generator Quick Start Front-Panel Menu Operation Front-Panel Menu Operation MODulation Menu Front-panel menu referenceFront-panel menu reference SYStem Menu Front-panel menu tutorial Messages Displayed During Menu Use Move across to the Power on command on this level Turn on the menuMove across to the SYS Menu choice on this level Cycle the power to restore the default values Move down a level to the Parameter choicesSave the change and turn off the menu Increment the first digit until 300.0 mVPP is displayed Select amplitude adjustmentMove down a level to the OUT Term command To select the output terminationMove down a level and then across to the High Z choice To output a modulated waveform Select AMUse the menu to select the shape of the modulating waveform Move down a level verify that Sine is selected Set the modulating frequency to 200 HzSet the modulation depth to 80% Move down a level to the Secured command To unsecure the function generator for calibrationMove across to the CAL Menu choice on this level Move down to the parameters level Calibration Procedures Calibration Procedures Agilent Calibration Services Calibration IntervalTime Required for Calibration Recommended Test Equipment Automating Calibration ProceduresTest Considerations Self-Test Performance Verification TestsQuick Performance Check Function Gain and Linearity Verification Frequency VerificationAC Amplitude Verification DC Function Offset VerificationAC Amplitude Verification Vrms 0.00035 Vrms 15.00 MHz Amplitude Flatness VerificationVrms 0.0061 Vrms AM Modulation Depth VerificationSquare Wave Duty Cycle Verification Optional Performance Verification TestsDistortion Verification Characters Calibration Security CodeTo Unsecure the Function Generator Without the Security Code Calibration Message Calibration CountMove across to the Calibrate choice General Calibration/Adjustment ProcedureMove down a level to the Unsecured command Begin the Frequency and Burst Rate adjustment procedureCalculate and save the new value Perform the next adjustment procedureAborting a Calibration in Progress Frequency and Burst Rate AdjustmentAC Amplitude Adjustment High-Z Function Gain and Linearity AdjustmentAC Amplitude Adjustment High-Z Frequency Amplitude Modulation AdjustmentAC Amplitude Adjustment 50W AC Amplitude Adjustment 50W Adjustment for KHz Setup DC Output AdjustmentAC Amplitude Flatness Adjustment Duty Cycle AdjustmentAC Amplitude Flatness Adjustment Exiting Output Amplifier Adjustment Optional Error Messages System Error MessagesSelf-Test Error Messages Calibration Error Messages Theory of Operation Theory of Operation Self-test procedures are described in chapterThis discussion pertains to the block diagram shown on Block Diagram OverviewOutput Attenuator Block 8 on block diagram page 129 Schematic onOutput Amplifier Block 7 on block diagram page 129 Schematic on740 R710 R717 740 R710 R711 R715 R716 R719 R720 AM Modulation Square Wave and Sync Block 6 on block diagram page 129 Schematic onBlock 6 on block diagram page 129, schematic on Pre-attenuatorSquare Wave and Sync Filters Block 5 on block diagram page 129 Schematic onWaveform DAC/Amplitude Leveling/Waveform RAM Block 4 on block diagram page 129 Schematic onWaveform DAC/Amplitude Leveling/Waveform RAM Direct Digital Synthesis DDS Asic Block 2 on block diagram page 129 Schematic onSystem DACs Block 3 on block diagram page 129 Schematic onFloating Logic Block 1 on block diagram page 129 Schematic onEarth-Referenced Logic Power SuppliesBlock 9 on block diagram page 129 Schematic on Block 10 on block diagram page 129 Schematic onPower Supplies Block 11 on block diagram page 129 Schematic on Display and KeyboardSee Service Service Does the function generator fail self-test? Operating ChecklistIs the function generator inoperative? See To prepare the function generator for use onCall 1-877-447-7278 and ask for Agilent Express Types of Service AvailableCleaning Repackaging for ShipmentAgilent suggests that you always insure shipments Surface Mount Repair Electrostatic Discharge ESD PrecautionsTo Replace the Output Protection Fuse F801 To Replace the Power-Line FuseUnit Fails Self-Test Troubleshooting HintsUnit Reports Error Unit is InoperativePower Supply Problems Power-On Self-Test Self-Test Procedures625 112 Replaceable Parts Replaceable Parts Main PC Assembly 116 117 118 119 120 121 122 123 Display and Keyboard PC Assembly 33120A Mainframe Manufacturer’s List Schematics8 Schematics Block Diagram Pull Off Handle Loosen Captive Sheet 1 132 Sheet 3 Sheet 4 Waveform DAC Schematic 134 Sheet 5 136 Sheet 7 Sheet 8 Output Attenuator Schematic 138 Sheet 9 of 10 Earth Reference Logic Schematic Sheet 10 Power Supplies Schematic 140 Sheet 1 of 1 Display and Keyboard Schematic TOP Side 33120-66521 REV a TOP Side 33120-66502 REV C Manual Part Number